So, long story short, I wound up with an undocumented, undumped "EAA" version of Sexy Parodius running on an odd 2002 FPGA recreation of GX hardware with a terrible audio solution.
Here's a video of it running:
And an old video where I talk about it (though the video was hooked up incorrectly):
I plan on dumping the roms once my dumper arrives. If anyone knows anything about this or has questions (or wants to buy it for development reasons or whatever) shoot me a PM or an email.